I’m not sure I’m putting this in the right section but that’s my problem with paper as well 
I really don’t “get” files and organising systems. I can’t always work out what is worth filing, and what’s not. And as soon as something goes into a pile it takes a miracle for me to deal with it again.
I’d love to hear from organiser people who aren’t baffled by this, but also from anyone with paper issues or quirky systems too.
I’ve got heaps better in recent years but my brain fizzles when I look at eg the car insurance papers - should that be filed by year, under car, under insurance, in a fire proof box to be grabbed in an emergency, photographed and shredded, kept in the car, never ever kept in the car…..etc